Rotary pump



May 12,1931. C WRQNA 1,805,063

ROTARY'PUMP Filed Aug. 15. 1929 2 Sheets-Sheet 1 A d 0 6, o/

Z 00a ai gzz I l 6) no A1M l C. WRONA May 12, 1931.

RTRY PUMP 2 sheets-sheen 2 Filed Aug. 15, 1929 Patented May 12, 1931 Nr OFFICE casmrn wnoNA, or uerivn, rRANcn ROTARY PUMP Application led August 15, 1929, Serial No. 386,099, and in Luxemburg, September 8, 1928.

My invention relates to rotary pumps and concerns more particularly an embodiment i11- volving an improvement inV that type of machine known as a paddle pump.

The objects of my invention will be obvious to those skilled in the art in the following description when taken in connection with the vaccompanying drawing forming part of this speciiication and in which- 10 Fig. 1 is a vertical transverse section through my improved pump;

Fig. 2 is a longitudinal section taken therethrough;

Fig. 3 is la dle;

Fig. 4 is a front elevational View thereof;

Fig. 5 is a plan view thereof;

Fig. 6 is an elevational view of a plate detail;

Fig.

plate;

Fig. 8 is a section taken through a ring;

Fig. 9 is a front elevational view of said ring;

Figs. 10 to 13 are fragmentary elevational views illustrating the operation of my device; and

Fig. 14 is a section through a iow control arrangement.

Referring to the drawing more in detail, in a stator ais locked a ring b by any suitable means such as a pair of keys. Said ring b is adapted to receive two plates sliding into dove-tailed slots provided in said ring all of which' will hereinafter be described more in detail. A

A rotor d is provided with four radial slots d adapted to receive four addles e. The diameter of said rotor is ma e such with respect to the internal diameter of the ring b that there exists between the said rotor and the ring b an annular space b".

I provide in the stator a, the ring b and the plates c, inlet and outlet openings respectively receivingvinlet conduit A and outlet conduit R.

I provide the stator a with two cheeks or anges a1 and a2 secured thereto by any suitable means such as nuts' and bolts as shown. I dispose springs f each in a recess do pro- 7 is a transverse sectional view of said a side elevational view of a padvided in the bottom of the slots d of rotor d for pressing the paddles e against the ring b.

In my device l use hollow paddles instead of the usual solid paddles and preferably of the type illustrated in detail in Figs. 3 to 5 and having a series of drilled holes c".

As shown particularly in Fig. 3, each paddle is provided with a chamfer on the part thereof which rubs along the ring b, for the purpose of diminishing the contact surface with said ring and consequently a diminution in the wear of the said paddles as well as the said ring.

I provide each paddle with a sort of semicylindrical boss el adapted to slide in a corresponding semicylindrical groove (Z000. I provide in ring b a sort of cavity bo- The purpose of this arrangement will be obvious to those skilled in the art as the increase in pressure which takes place behind the paddle becomes edective at the momentwhen the paddle rides over the cavity and acts on the boss e1 which plays the part of a small piston exerting thereon a force opposed to the action of the springs f and substantially eliminates the friction of the paddles on the plates c whereby wear is prevented and constant tightness of the system assured.

With a view to producing good operation of my device I place the inner face of the bosses e1 in communication with the atmosphere by means of suitable channels drilled in the rotor as shown at e2 in Fig. 12.

Likewise I may provide my improved pump with suitable auxiliary packing means.

The rotor d is mounted in the stator a by any means well known in the art such as bearings.

I preferably have recourse to a device for regulating the operation or output of the um which consists in providing an outlet in t e outlet conduit, which outlet is controlled by an arrangement which will now be described with reference to Fig. 14.

As shown in the {igure g indicates a small piston-plug normally closing an escape con-l duit h connected at any convenient spot to the outlet conduit h1 of the pump. The movementof this piston g is opposed by the action of a spring i provided with suitable adjust-ing means not shown. From the foregoing it will be obvious that the piston g and the spring z' being regulated to balance a certain delivery pressure, as soon as said pressure is surpassed the piston is raised and allows a certain quantity of the delivered fluid to pass out ung til the desired pressure is re-established.

The operation of my improved pump will be obvious from the nature of the foregoing description.

A pump constructed in this manner is eX- tremely silent, has a constant output which is uniform, is of an extremely low net cost since it is machined, very easy to assemble and take apart and necessitates an upkeep which is practically nothing.

Adverting to Figs. 10 to 13, it will be noted that the volumes of the solid part and the hollow parts of the paddles are absolutely equal and that the fluid, particularly when said fluid is a liquid, circulates within the paddles which are extremely light and their stroke always takes place without shock.

The springs only act partially and the paddle is constantly braked by the liquid. In fact the said springs only act during coincidence of the chamfer of the paddles with the bevelled rear portion of the plates o. At this instant the liquid is able to become interposed between the paddle and the plate and is driven to the bottom of thepaddle slot.

The bosses e1 acting as small pistons yield under the pressure existing in the delivery zones in front of the paddles and separate them from the ring b in order to clear the plates e without friction.

While I have disclosed what I deem to be the preferred form of my device I 'do` not wish to be limited thereto as there might be various changes made in the construction and arrangement of the parts without departing from the spirit of my invention as comprehended within the scope ofthe appended claims.

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a ump of the type described having a stator, t e combination of a rotor concentrically disposed within said stator having a diameter smaller than said stator, a plurality of pairs of inlet and outlet conduits disposed in pairs, opening into the space existing between said rotor and said stator, a plurality of radially disposed slidably lmounted paddles carried by said rotor adapted to contact with said stator, a plurality of cut-oilI plates carried by said stator contacting with said rotor for successively pushing said paddles into said rotor when passing from an inlet conduit to an outlet conduit, there being a pressure retaining recess formed in said stator around each of said outlet conduits and a projection carried by each of said paddles adapted to slide in a groove formed the paddles slide are put in communication with the atmosphere by means of channels formed in the rotor substantially as described. In testimony whereof I hereunto aliix my signature.

CASIMIR WRONA. 

